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jack duppel
jack duppel, Auto Service Technician
Category: Ford
Satisfied Customers: 393
Experience:  ASE Certified Auto Technician
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Trouble code P0743 Torque Converter Clutch System Electrical.

Resolved Question:

Trouble code: P0743 Torque Converter Clutch System Electrical. What is the most common problem and how to solve it.
Submitted: 8 years ago.
Category: Ford
Expert:  jack duppel replied 7 years ago.

Hello Chris and Welcome to JA,

You will most likely end up removing the cover/pan to inspect the harness that goes to all the solonoids and then to inspect the valvebody and the TCC solonoid itself. If you have a multimeter then you could ohm through the harness and even the solonoid. I have found that most of the time this code was produced because of the solonoid itself. But it could be the circuits to it also. There is abig connector an top of the trans that goes into the trans and the internal harness ispect that connector for any corrosion or damaged pins or wires. Good Luck and if you need more just ask please.

P0743 TCCTCC solenoid circuit failure during on-board diagnostic.TCC solenoid circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM drive failure during on-board diagnostic.Failed ON - engine runs rough/vehicle shudder, engine stalls in DRIVE (2nd, 3rd or 4th) at low idle speeds. (Short circuit).
Failed OFF - torque converter clutch never engages (Open circuit) (MIL on).

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Customer: replied 7 years ago.
Thank you. The cover has been removed. Steel particles had been found inside. ATF quite black

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